Re: [Qemu-devel] [RFC PATCH 2/2] pci: enable RedHat pci bridges to reserve more buses

[Marcel Apfelbaum <marcel@redhat.com>]

On 19/07/2017 16:56, Konrad Rzeszutek Wilk wrote:
> On Wed, Jul 19, 2017 at 04:20:14PM +0300, Aleksandr Bezzubikov wrote:
>> In case of RedHat PCI bridges reserve additional buses, which number is provided
> 
> It is "Red Hat"
>> in a vendor-specific capability.
> 
> And perhaps also a #define ?

Right, please add it to src/hw/pci_ids.h.

Thanks,
Marcel


>>
>> Signed-off-by: Aleksandr Bezzubikov <zuban32s@gmail.com>
>> ---
>>   src/fw/pciinit.c | 12 ++++++++++--
>>   1 file changed, 10 insertions(+), 2 deletions(-)
>>
>> diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c
>> index 08221e6..b6f3a01 100644
>> --- a/src/fw/pciinit.c
>> +++ b/src/fw/pciinit.c
>> @@ -578,9 +578,17 @@ pci_bios_init_bus_rec(int bus, u8 *pci_bus)
>>           pci_bios_init_bus_rec(secbus, pci_bus);
>>   
>>           if (subbus != *pci_bus) {
>> +            u16 vendor = pci_config_readw(bdf, PCI_VENDOR_ID);
>> +            u8 res_bus = 0;
>> +            if (vendor == 0x1b36) {
>> +                u8 cap = pci_find_capability_bdf(bdf, PCI_CAP_ID_VNDR, 0);
>> +                if (cap) {
>> +                    res_bus = pci_config_readb(bdf, cap + 16);
>> +                }
>> +            }
>>               dprintf(1, "PCI: subordinate bus = 0x%x -> 0x%x\n",
>> -                    subbus, *pci_bus);
>> -            subbus = *pci_bus;
>> +                    subbus, *pci_bus + res_bus);
>> +            subbus = *pci_bus + res_bus;
>>           } else {
>>               dprintf(1, "PCI: subordinate bus = 0x%x\n", subbus);
>>           }
>> -- 
>> 2.7.4
>>
>>